Document Ref 903647-001 Rev 3
Page 4-3
Component Technical Manual
PAS V3 Pump for Fuel Dispensers
NOTE
If the vent is difficult to reach
:
Try to feel with your hand if a stream of air or vapour is expelled from the vent.
If the inlet pressure is too high, check:
- if the filter is clean
- correct working of the foot valve
- installation up to the reservoir (non-return valve, dirt blocking the flow, tank filter clogged,
and so on).
4.3
Air Vent
Place one end of a tube (inner diameter 12 mm) with a 3/8" BSP thread coupling on the
vent and drop the other end of the tube in a small tank with fuel (same fuel as tank).
Start the pump in by-pass mode by removing the nozzle from its holder and let it run for a
while before opening the nozzle.
- When bubbles appear constantly, it means that there is an air entry in the pump or the
installation before the pump
- If the fuel is sucked into the pump, the recovery float valve is not closing properly
Put the tube in the tank (not too
deep), and check if there are
bubbles
Issue B
4.4
Internal Air Entry in the Pump
Below a list of possible causes for air to enter the pump:
1)
Filter cover O-ring incorrectly positioned or dilated.
2)
O-ring between filter box and PAS body incorrectly positioned or dilated.
3)
One of the sealing rings between the connection to ground piping and filter box is defective
or insufficiently tightened.
4)
Float assembly blocked in an open position, installed incorrectly or a loose particle is in
between.
